The cortex makes up the bulk of the hair shaft and is primarily made of protein. Inside the cortex, we have disulfide bonds that hold the protein together, which makes the hair strong and resilient.

The key to maintaining a balance between moisture vs protein is the secret for achieving strong, soft and shiny hair. Check out our guide.

protein-based treatments are a great place to start. For damaged hair, proteins in products help to strengthen the bonds in our hair strands and in turn make our hair feel stronger and able to ...

So how does protein synthesis make hair? If you've looked at the activity (or even the text version of the activity), you know how a section of DNA instructs a cell how to make a protein.

If you've ever used a bond-building treatment (hello, Olaplex devotees), only to find your hair feeling more damaged than ...

Keratherapy offers both short-term and long-lasting products and professional treatments to restore the keratin content of ...

Within a protein, multiple amino acids are linked together by peptide bonds, thereby forming a long chain. Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it ...